package com.ruoyi.web.controller.common;

import cn.hutool.core.io.FileUtil;
import com.ruoyi.common.config.RuoYiConfig;
import com.ruoyi.common.constant.Constants;
import com.ruoyi.common.constant.FileSuffix;
import com.ruoyi.common.core.domain.AjaxResult;
import com.ruoyi.common.exception.file.FileNameLengthLimitExceededException;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.file.FileUploadUtils;
import com.ruoyi.common.utils.file.FileUtils;
import com.ruoyi.common.utils.file.MimeTypeUtils;
import com.ruoyi.framework.config.ServerConfig;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.io.IOUtils;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.jodconverter.DocumentConverter;
import org.jodconverter.document.DefaultDocumentFormatRegistry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartFile;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.UUID;

/**
 * 通用请求处理
 *
 * @author ruoyi
 */
@RestController
@RequestMapping("/common")
public class CommonController {
    private static final Logger log = LoggerFactory.getLogger(CommonController.class);

    @Autowired
    private ServerConfig serverConfig;

    private static final String FILE_DELIMETER = ",";

    @Resource
    private DocumentConverter documentConverter;

    /**
     * 通用下载请求
     *
     * @param fileName 文件名称
     * @param delete   是否删除
     */
    @PostMapping("/download")
    public void fileDownload(String fileName, Boolean delete, HttpServletResponse response, HttpServletRequest request) {
        try {
            if (!FileUtils.checkAllowDownload(fileName)) {
                throw new Exception(StringUtils.format("文件名称({})非法，不允许下载。 ", fileName));
            }
            String realFileName = System.currentTimeMillis() + fileName.substring(fileName.indexOf("_") + 1);
            String filePath = RuoYiConfig.getDownloadPath() + fileName;

            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, realFileName);
            FileUtils.writeBytes(filePath, response.getOutputStream());
            if (delete) {
                FileUtils.deleteFile(filePath);
            }
        } catch (Exception e) {
            log.error("下载文件失败", e);
        }
    }

    /**
     * 通用上传请求（单个）
     */
    @PostMapping("/upload")
    public AjaxResult uploadFile(MultipartFile file) throws Exception {
        try {
            // 上传文件路径
            String filePath = RuoYiConfig.getUploadPath();
            // 上传并返回新文件名称
            String fileName = FileUploadUtils.upload(filePath, file);
            String url = serverConfig.getUrl() + fileName;
            AjaxResult ajax = AjaxResult.success();
            ajax.put("url", url);
            ajax.put("fileName", fileName);
            ajax.put("newFileName", FileUtils.getName(fileName));
            ajax.put("originalFilename", file.getOriginalFilename());
            return ajax;
        } catch (Exception e) {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 通用上传请求（多个）
     */
    @PostMapping("/uploads")
    public AjaxResult uploadFiles(List<MultipartFile> files) throws Exception {
        try {
            // 上传文件路径
            String filePath = RuoYiConfig.getUploadPath();
            List<String> urls = new ArrayList<String>();
            List<String> fileNames = new ArrayList<String>();
            List<String> newFileNames = new ArrayList<String>();
            List<String> originalFilenames = new ArrayList<String>();
            for (MultipartFile file : files) {
                // 上传并返回新文件名称
                String fileName = FileUploadUtils.upload(filePath, file);
                String url = serverConfig.getUrl() + fileName;
                urls.add(url);
                fileNames.add(fileName);
                newFileNames.add(FileUtils.getName(fileName));
                originalFilenames.add(file.getOriginalFilename());
            }
            AjaxResult ajax = AjaxResult.success();
            ajax.put("urls", StringUtils.join(urls, FILE_DELIMETER));
            ajax.put("fileNames", StringUtils.join(fileNames, FILE_DELIMETER));
            ajax.put("newFileNames", StringUtils.join(newFileNames, FILE_DELIMETER));
            ajax.put("originalFilenames", StringUtils.join(originalFilenames, FILE_DELIMETER));
            return ajax;
        } catch (Exception e) {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 本地资源通用下载
     */
    @PostMapping("/download/resource")
    public void resourceDownload(String resource, HttpServletRequest request, HttpServletResponse response) throws Exception {
        try {
            if (!FileUtils.checkAllowDownload(resource)) {
                throw new Exception(StringUtils.format("资源文件({})非法，不允许下载。 ", resource));
            }
            // 本地资源路径
            String localPath = RuoYiConfig.getProfile();
            // 数据库资源地址
            String downloadPath = localPath + StringUtils.substringAfter(resource, Constants.RESOURCE_PREFIX);
            // 下载名称
            String downloadName = StringUtils.substringAfterLast(downloadPath, "/");
            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, downloadName);
            FileUtils.writeBytes(downloadPath, response.getOutputStream());
        } catch (Exception e) {
            log.error("下载文件失败", e);
        }
    }


    /**
     * 签章文件上传
     */
    @PostMapping("/pdf/upload")
    public AjaxResult uploadPdfFile(MultipartFile file) throws Exception {
        try {
            // 获取文件名长度
            int fileNameLength = Objects.requireNonNull(file.getOriginalFilename()).length();
            // 如果文件名长度超过默认长度，抛出异常
            if (fileNameLength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH) {
                throw new FileNameLengthLimitExceededException(FileUploadUtils.DEFAULT_FILE_NAME_LENGTH);
            }
            // 上传文件路径
            String filePath = RuoYiConfig.getUploadPath();

            // 检查文件类型是否允许上传
            FileUploadUtils.assertAllowed(file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
            // 获取文件后缀名
            String fileSuffix = Objects.requireNonNull(file.getOriginalFilename()).substring(file.getOriginalFilename().lastIndexOf(".") + 1);
            // 提取文件名
            String fileName = FileUploadUtils.extractFilename(file);

            // 获取文件绝对路径
            String absPath = FileUploadUtils.getAbsoluteFile(filePath, fileName).getAbsolutePath();
            // 将文件保存到指定路径
            file.transferTo(Paths.get(absPath));

            // 判断是否是图片文件  转为PDF格式
            if (!FileSuffix.PDF.equals(fileSuffix)) {
                String path = absPath.substring(0, absPath.lastIndexOf(".") + 1) + "pdf";
                File rename = FileUtil.rename(new File(absPath), UUID.randomUUID() + "." + fileSuffix, true);
                documentConverter.convert(rename).to(new File(path)).as(DefaultDocumentFormatRegistry.PDF).execute();
                String newFileName = FileUploadUtils.extractFilename(fileToMultipartFile(new File(path)));
                rename.delete();
                return getPdfData(path, getPathFileName(filePath, newFileName), new File(path).getName(), serverConfig.getUrl() + getPathFileName(filePath, fileName));
            }
            return getPdfData(absPath, getPathFileName(filePath, fileName), file.getOriginalFilename(), serverConfig.getUrl() + getPathFileName(filePath, fileName));
        } catch (Exception e) {
            return AjaxResult.error(e.getMessage());
        }
    }

    public MultipartFile fileToMultipartFile(File file) {
        FileItem item = new DiskFileItemFactory().createItem("file", MediaType.MULTIPART_FORM_DATA_VALUE, true, file.getName());
        try (InputStream input = new FileInputStream(file); OutputStream os = item.getOutputStream()) {
            // 流转移
            IOUtils.copy(input, os);
        } catch (Exception e) {
            throw new IllegalArgumentException("Invalid file: " + e, e);
        }
        return new CommonsMultipartFile(item);
    }

    public AjaxResult getPdfData(String filePath, String fileName, String originalFilename, String url) {
        AjaxResult ajax = AjaxResult.success();
        File file = new File(filePath);

        try (PDDocument document = PDDocument.load(file)) {
            int pageCount = document.getNumberOfPages();

            ajax.put("pages", pageCount);
            ajax.put("url", url);
            ajax.put("fileName", fileName);
            ajax.put("newFileName", FileUtils.getName(fileName));
            ajax.put("originalFilename", originalFilename);

            List<Float> widthList = new ArrayList<>();
            List<Float> heightList = new ArrayList<>();


            for (int i = 0; i < pageCount; i++) {
                PDPage page = document.getPage(i);
                float width = page.getMediaBox().getWidth();
                float height = page.getMediaBox().getHeight();
                widthList.add(width);
                heightList.add(height);
            }

            ajax.put("width", widthList);
            ajax.put("height", heightList);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return ajax;
    }

    public static String getPathFileName(String uploadDir, String fileName) throws IOException {
        int dirLastIndex = RuoYiConfig.getProfile().length() + 1;
        String currentDir = StringUtils.substring(uploadDir, dirLastIndex);
        return Constants.RESOURCE_PREFIX + "/" + currentDir + "/" + fileName;
    }
}
